[Bug driver/103949] gcc fails to provide a standard conforming C11 or C++17 environment even when specifying -std=c11 or -std=c++17

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103949

--- Comment #11 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Jonathan Wakely from comment #10)
> Oh I missed the part about __STDCPP_THREADS__ not being defined for
> mingw-w64. That seems like it's worth a distinct bug report that can focus
> just on that.

I don't think that is a bug though because that mingw toolchain was configured
with --enable-threads=single in that case (so libstdc++ does not have the full
support). Most likely it needs to be configured with --enable-threads=win32 to
support that.